Method of manufacturing nuts.



C..P. MARYE. METHOD 0F MAN UUUUUUUUUUUUU S.

IWW/l r sans nan cme.

(CLIFFORD P. MARYE, 0F SOUTH WHITLEY, INDIANA, ASSIGNOR 0F ONE-THIRD T0 WU1L-A. RGSENBAUM, TRUSTEE, 0F NEW ROCHELLE, NEW YORK.

METHOD 0F MANUFACTURING NUTS.

Specification of Letters Patent.

Patented Jan. 2, 1917.

Applieation med Hay 29, 1914, Serial No. 841,763. Renewed May 25, 1916. Serial No. 99,919.

To all lwhom it may concern.'

Be it known that ll, CLIFFORD F. MARYE, a citizen of the United States, residing at South Whitley, in the county of Whitley and State of Indiana, have invented certain new and useful Improvements in Methods of Manufacturing Nuts, of which the following is a full, clear, and exact description.

rllhis invention is a -method of manufacturing nuts of the character described in my application for patent filed March 24, 1913,

' Serial No. 756,282,1.he object of the invention being primarily to provide a' method whereby the cost of manufacturing these nuts will be small.

rThe nut referred to in my said application for patent is one which is capable of retaining itself upon its bolt, making all extraneous locking devices unnecessary.

The nut consists essentially of a solid structure provided with a continuous thread from one end to the other of its bore, the thread "comprising two sections, one succeeding the other, and each extending ap.- proximately one-half way through the bore of the nut. The thread is of uniform character throughout, but one section thereof is 'bodily oset from the other in anaxial direction a slight distance amounting to a mere fraction vof the width of one thread,

1 thus bringing the threads of the two sections slightly out` of helical alinement, whereby a nut will screw freely over the bolt until the threads on the latter encounter the second section of thread in the nut, whereupon friction will be developed between the threads of the nut and those of the bolt suiiicient to prevent the turning of the nut without the application of considering this nut with its two oHset sections of thread at a cost, which renders the manu- .facture commercially practicable.'

The present'invention aords a ymethod by which the 'cost of production is very little if any more .than that of the ordinaryv `nut. This method will now jbe described with reference to the accompanying drawing, in Which- Figure 1 is a side view of a form of tap that may be used in carrying out my method; Fig. 2 is a central section of a nut at one stage of its manufacture; Fig. 3 is a similar section of the nut in its completed condition. Figs. 4 and 5 are diagrams illustrating how the threads may be cut.-

'lhe tap which l prefer to use in carrying out this method and which is illustrated in Fig. 1, is provided at its forward end with a section 1 of cutting threads havin the same pitch as the thread of the inishe nut but adapted to cut onlya shallow unfinished thread. 'lhis advance section of thread on the tap is immediately followed by a second section 2 of the same pitch as section 1, but

'adapted to cut deeper and to finish the threading operation. rlhis second section 2 of the tap is bodily o'set in an 'axial direction from the section 1 a distance equal to a small fraction of the width of one thread, so that the thread of section 2 will be slightly out of helical alinement with the thread of section '1 at the pointfwhere they collide. The offsetting of thetwo sections of thread on the tap may beeither toward or away from each other, the form shown being that in which the two sections are o'set toward each other. c

The nut before it is threaded is the usual solid structure having a smooth passage eX- tending through it. The tap of Fig.v l is rst passed into the bore vof the nut, say from the right hand toward the left hand side, whereuponthe advance section l of the tap cuts a partiallynished thread throughout, such for instance as illustrated by the full lines 3 of Fig. 4, they same partial thread being illustrated at 3 in Fig. 2. The tap proceedsalong the bore ofthe nut until the section 2 of the tap enters the nut, whereupon the deeper finished thread is cut along the passage of the nuty as .far as the divisional line between the two sections on the tap is allowed lto enter the nut, which will ordinarily be the middle point of the nut. lnasmuch as the thread of section 2 of the tap is offset axially from the thread of section 1, and likewise from the thread in the nut, which is previously cut by the section 1, the section 2 of the tap will cut away one surface of the thread 3 to the extent of the off-setting, the cut thus made being indicated by the dotted lines t in Fig. 4. The completed thread thus formed by section 2 of the tap will thus have all of its peaks moved or offset toward the center of the .nut the predetermined distance provided by the tap. In this first operation of the tap,

the advance section l thereon not only makes a partial cut of the thread to lessen the work required by the section 2 of the tap, but by reason of its engagement with the walls of the nut, it compels the second section 2 of the tapto cut away one surface of the previously formed partial threads. ln the absence of any engagement between the advance section of the tap and the wall of the nut, there would be a tendency of the section 2 to follow exactly along the partially cut thread and thus remove equal portions from both surfaces of that thread and producing a finished thread which would be exactly yin helical .alinement with the unfinished threadywhich, of course, is not desired in the present instance. The next operation is 'to back out the tap from the nut and introduce it into the left side of the bore. InA

this movement, the advance section l of the tap-runs freely along the unfinished section 3; the. section 2 of the tap then follows and is again forced to cut one face from theiunfinishedrthreads as indicated by thedotted lines 5 inFig. 4. The side of the thread cut away in this instance is opposite that cut away in the first operation, so that the peaks of this portion of the finished thread will all be advanced toward the center of the nut to an extent equal to -the amount of offset of sections l and 2 of the tap. The tap is continued inward until its section 2 collides'at the middle point of the nut with the other finished half of the-thread; it is V then backed out and the nutis finished as in Fig. 3. It will thus be seen that since the sections of thread in veach half of the nut have both been off-set toward the middle point of the nut, the total amount of the offset of one section of thread with respect to the other in the finished nut will be equal to twice the offsetting between the sections y.

of the tap. It is obvious, however, that in convolutlon of thread at the middle or colliding point is reduced in width, in Fig.

indicating the reduced width andy the normal width, and when the offsetting of the sections is in a direction away from each other, the middle convolution is left thicker than the others, Fig. 5, indicating the thicker convolution and y the normal convolution.

Themethod herein described can be carried out with one or two taps of the character shown in Fig. l, but it will be preferable to mounttwo of the taps in a machine and cause one of them to enter the nut from one side and the other to enter from the'opposite side while the first is being withdrawn. ln this way the cost of production will be but little if any morethan that of the ordinary nut.4

lf claim 1. The method of forming a thread in a nut which consists in cutting an unfinished thread of uniform character throughout the .bore of the nut, then cutting away one surface of the unfinished thread throughout a portion of its length and finally cutting away the opposite surface of the remainder of the unfinished thread, for the purpose set forth,

2. The method of forming a thread in a nut which' consists in cutting ajthread'gof uniform character throughout the bore of the nut then cutting away one surface of said thread throughout a portionlzgof its length.

In witness whereof, I subscribefmy signature, in the presence of two witnesses.

CLIFFORD P. MARYE.

Witnesses:

WALDO M: CHAPIN, J osEPH BUCKLEY. 

